Wheel brake



P. KARSTEN June 16, 1931.

WHEEL BRAKE Filed Oct. 2. 1929 llllrr INVEf-r-DFQ PETER KA RSTE'* Patented June 16, 1931 UNITED 'STATES PATENT OFFICE PETER KABSTEN, 0F DUSSELDORF, GERMANY, ABSIGNOR T0 RHEINISCHE METALL- 'WAABEN- UND MASCHINENFABBIK SOMMERDA AKTIENGESELLSCHAFT, 0F SOLL MERDA, GERMANY, A CORPORATION OF GERMANY WHEEL BRAKE Application led October 2, 1929, Serial Fo. 396,624, and in Germany November 12, 1928.

My invention relates to air-actuated wheel brakes of the type described in the specification of my rio-pending patent application Serial Number 251,812. In this s ecication an air brake is described each o the brake jaws of which is actuated by a swing piston arranged in a casing, these pistons having between them an air-tight inflatable body. This hollow body is inflated by supplying air under pressure and by its expansion causes a swing motion of the pistons and of the brake jaws connected thereto.- My invention has for its object to improve air brakes of this class as to the construction of the casing and arran ement of the swing pistons therein, where y a uniform stress of the iniatable hollow body is obtained and both its durability and life is increased and a satisfying air-tight motion of the pistons in the casing is secured.

With these ends in view, my invention consists in the fact that each of the pistons is adapted to swing about a fulcxum which is arranged in the casing diametrically oppositel to the fulcrum of the companion iston. his arrangement results in the act of the pistons in swinging being always in a position parallel to one another.

In order that my invention can be more easily understood, a preferred embodiment of the same is illustrated by way of exam le in the drawing which shows a two-jaw rake intended for the wheels of an autocar. In this drawing Figure 1 is a diametrical section through a wheel and the Vbrake attached thereto,

Figure 2 is a sectional end view through the same parts with the brake in inoperative position, and

Figure 3 is a similar view with the brake applied.

Referring to these figures, a1 and a2 denote the two pistons that may swing about the pins bl and b2, respectively, the latter further connecting the outer parallel plates c1 and c,

of the casing to the jaw carrier which is tixedly mounted on the wheel axle. Normall to the plates c1 and c2 are arranged wal e and e, which are curved inside about the pins b1, b2. The plates c1, 0 walls e, e1, and the swing pistons al, a, thus form a casing closed on all sides. In this casing is lod ed the hollow rubber body f to which air or developing the braking action is conducted by means of a pipe or hose g which passes through the piston a2, and is connected with a suitable source of compressed air. The swinging motion of the pistons a, and a, is transmitted to the brake jaws i', and z', by rbds h, and h, which are adjustable in length.

Upon the hollow rubber bo y f being inflated by air under pressure, the pistons a1, a2 execute a swinging motion in parallel to one another, and at length assume the position shown in Figure 3, the shape of body f changing accordingly in such a manner that its rectangular cross section is maintained in the one (radial) direction while in the direction normal thereto the original approxmately rectangular shape uniforml increases and the walls of body f expand uni ormly.

What Lclaim and desire to secure by Letters Patent is f 1. A Huid motor for compressed air brake systems, particularly for power driven vehicles, comprising two spaced parallel fixed plates, two curved wall sections extending between said plates in transverse perpendicular relation thereto, two swinging pistons pivoted at diagonall opposed points of said wall sections and aving their free ends movable along the same, an iniiatable elastic member enclosed between said pistons and wall sections, and a compressed air conduit passing through one of said pistons for conucting air under pressure to said iniiatable member whereby said pistons are ivotally actuated in opposite directions to evelop a braking actiom 2. A uid motor for compressed air brake systems, particularly for power driven vehicles, comprising two spaced parallel fixed lates, two curved Wall sections extending etween said plates in transverse perpendicu- 5 lar relation thereto, two swinging pistons pivoted at diagonally opposed points of said wall sections and having their free ends movable along the same, an inflatable elastic member enclosed between said pistons and Wall 1o sections, and means for conducting air under pressure to said inflatable member whereby said pistons are pivotally actuated in opposite directions to develop a braking action.

In testimony whereof I have affixed my 15 signature.

PETER KARSTEN.

15 signature.

PETER KAR STEN.

CERTIFIATE 0F CORRECTION.

Patent No. 1,810,354. Granted June i6. 1931, to

PETER KARSTEN It is 'hereby certified that the above numbered patent was erroneously issued to "Rheinische Metallwaarenund Maschinenfabrik Sommerda Aktiengesellschaft, of Sommerda, Germany, n Corporation of Germany". whereas said patent should have been issued to Rheinische Metallwaarenund Maschinenfabrik Sommerda Aktiengesellschaft, of Sommerda` Germany, a Corporation of Germany, and Fritz Faudi, of Dusseldof, Germany, as shown by the records of assignments in this oftice; and that the said LettersPatent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of August, A. D. 1931.

n. J. um, (Sell) Acting Commissioner of Patente.

CERTIFICATE oF CORRECTION.

Patent N0. 1,810,354. Granted June I6. 193|, tn

PETER KARSTEN It is hereby certified that the above numbered patent was erroneously issued to "Rheinische Metallwaarenund Maschinenfabrik Sommerda Aktiengesellschaft. of Sommerda, Germany, a Corporation of Germany". whereas said patent should have been issued to Rheinische Metallwaarenund Maschinenfabrik Sommerda Aktiengesellschaft, 'of Sommerda. Germany, a Corporation of Germany. and Fritz Faudi, of Dusseldof, Germany, as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of August, A. D. 1931.

M. J. Moore, (sul) Acting Commissioner of Patents. 

